It's worth it if you have the money to spend on it.
If it's a situation where you're saving up for a special occasion, then it's not that special. The Cagelles will dance on the tables. They'll interact with you here and there for four numbers (very brief), and Albin and Georges each have one moment with you. All very brief, and nothing stand-out. Just a bit of extra fun.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle